linux-kernel - Re: [PATCH] kernel/printk: do not turn off bootconsole in printk_late_init if keep

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Message-Id: <20110819171024.7805dec6.akpm@linux-foundation.org>
Date:	Fri, 19 Aug 2011 17:10:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nishanth Aravamudan <nacc@...ibm.com>
Cc:	"Fabio M . Di Nitto" <fabbione@...bione.net>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <gregkh@...e.de>
Subject: Re: [PATCH] kernel/printk: do not turn off bootconsole in
 printk_late_init if keep_bootcon

On Tue,  9 Aug 2011 17:02:33 -0700
Nishanth Aravamudan <nacc@...ibm.com> wrote:

> It seems that commit 7bf693951a8e5f7e600a45b74d91d962a453146e doesn't
> always achieve what it aims, as printk_late_init() runs it
> unconditionally turns off all boot consoles. With this patch, I am able
> to see more messages on the boot console in KVM guests than I can
> without, when keep_bootcon is specified.
> 
> Signed-off-by: Nishanth Aravamudan <nacc@...ibm.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
> Cc: Greg KH <gregkh@...e.de>

The patch is applicable to 2.6.39.x and to 3.0.x but I'm unable to work
out if the end-user impact is sufficiently serious to warrant
backporting the fix into those kernels.

Please let us know you opinion on this.
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